right my new tank (well not quite new!)is a 240L Juwel rio. i have ripped out the internal filter right my stocking, it wont be massively planted as i wanted to go for a cichlid tank but now i want a community but just with some larger slightly more expensive fish so for my 240L tank would this work.? 4 keyholes (i prefer the shorter finned females but do i need a male?) 4 bosemani rainbows 4 Melanotaenia Praecox (dwarf rainbow) and a small shoal of harlequins (say 8-10) 1 BN (my 2 clown plecs would probaly move in as well) would they work at all? should i increase or decrease any of the numbers? cheers.